/Engine/Plugins/Media/PixelStreaming/Source/PixelStreaming/Public/IPixelStreamingStreamer.h
Set the target window for this streamer. This is used to ensure mouse events are directed to the correct window if multiple windows are tiled on top of one another as seen in the editor.
void SetTargetWindow ( [TWeakPtr](API\Runtime\Core\Templates\TWeakPtr)< [SWindow](API\Runtime\SlateCore\Widgets\SWindow) > InTargetWindow )